EGU22-1504, updated on 27 Mar 2022
https://doi.org/10.5194/egusphere-egu22-1504
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Heat flow and thermal regime in the Guaymas Basin, Gulf of California: Estimates of conductive and advective heat transport

Florian Neumann1, Raquel Negrete-Aranda1,2, Robert N. Harris3, Juan Contreras1, Christophe Galerne4, Manet S. Peña-Salinas5, Ronald Spelz-Madero6, Daniel Lizarralde7, Andreas Teske8, Tobias Hoefig9, and the Expedition 385 Scientists*
Florian Neumann et al.
  • 1Tectonophysics and Heat Flow Laboratory, Geology Department, CICESE, Ensenada, Mexico (fneumann@cicese.mx)
  • 2Catedrático CONACYT, CICESE, Ensenada, Mexico
  • 3Collage of Earth, Ocean and Atmospheric Science, Oregon State University, USA
  • 4Universität Bremen, AG Petrology of the Ocean Crust, Department of Geosciences, Bremen, Germany
  • 5UABC, Department of Coastal Oceanography, Ensenada, Mexico
  • 6UABC, Geology Department, Ensenada, Mexico
  • 7Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole USA
  • 8Department of Marine Sciences, University of North Carolina at Chapel Hill, USA
  • 9International Ocean Discovery Program, Collage Station, USA
  • *A full list of authors appears at the end of the abstract

Heat flow is estimated at eight sites drilled during Integrated Ocean Drilling Program (IODP) Expedition 385 in the sedimented Guaymas Basin, Gulf of California. One of the expedition objects was designed to understand the thermal regime of the basin and to better understand heat transfer mechanisms from sill intrusions into organic-rich sediment. Sedimentation corrections are significant and increase basin values of heat flow values on average by 12% and range from 119 to 221 mW/m2 in the basin. Thermal analysis suggests that heat flow in the basin is distributed equally between conductive and advective heat transfer for plate ages older than 0.2 Ma. At Ringvent, Site U1547 a young sill intrusion is related to locally elevated heat flow displaying values between 257 and 1000 mW/m2. Thermal analysis of the five holes drilled at Site U1547 suggests that the sill structure hosts an active hydrothermal system. Our study suggests that rapidly cooling intrusion led to discharge velocities between 15 – 40 mm/yr and possibly recharge of the system may occur through normal faults. To be consistent with the heat output, we estimate the sill intrusion thickness to be ~240 m. The highly three-dimensional nature of the sill intrusion at Site U1547 and the question of its thickness add considerable complications which are currently investigated in complementary studies.

Expedition 385 Scientists:

Andreas P. Teske; Daniel Lizarralde; Tobias W. Höfig; Ivano W. Aiello; Janine L. Ash; Diana P. Bojanova; Martine Buatier; Virginia P. Edgcomb; Christophe Y. Galerne; Swanne Gontharet; Verena B. Heuer; Shijun Jiang; Myriam A.C. Kars; Ji-Hoon Kim; Louise M.T. Koornneef; Kathleen M. Marsaglia; Nicolette R. Meyer; Yuki Morono; Raquel Negrete-Aranda; Florian Neumann; Lucie C. Pastor; Manet Peña-Salinas; Ligia L. Pérez Cruz; Lihua Ran; Armelle Riboulleau; John A. Sarao; Florian Schubert; S. Khogenkumar Singh; Joann M. Stock; Laurent M.A.A. Toffin; Wei Xie; Toshiro Yamanaka; Guangchao Zhuang

How to cite: Neumann, F., Negrete-Aranda, R., Harris, R. N., Contreras, J., Galerne, C., Peña-Salinas, M. S., Spelz-Madero, R., Lizarralde, D., Teske, A., and Hoefig, T. and the Expedition 385 Scientists: Heat flow and thermal regime in the Guaymas Basin, Gulf of California: Estimates of conductive and advective heat transport, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-1504, https://doi.org/10.5194/egusphere-egu22-1504, 2022.

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